Laboratory-scale controlled-atmosphere chamber for use with premium coal samples

Filla, B. James; Callanan, Jane E.
April 1985
Review of Scientific Instruments;Apr1985, Vol. 56 Issue 4, p592
Academic Journal
The recent availability of premium coal samples makes it desirable to have the capability for working with these materials, in one’s own laboratory, in an atmosphere which can be controlled. A controlled-atmosphere chamber, large enough to allow for processing samples yet small enough to fit easily in an ordinary laboratory, has been designed and fabricated. The overall cost of this controlled-atmosphere chamber was competitive with commercially available systems. The major advantages of this specific system include: convenient size and reversible design for use in a limited work space; incorporation of a full vacuum antechamber that minimizes loss of the working chamber purified atmosphere; and a recirculating system with a bypass valve arrangement allowing separate or combined operation of oxygen and moisture removal systems. The design features were combined to create a unique apparatus capable of both the specific use for which it was intended and general controlled-atmosphere chamber applications. Compatible modular-design work chambers could have been purchased from commercial vendors; however, it still would have been necessary to custom fabricate both the antechamber and recirculation system to meet the requirements of the anticipated experimental work.


Related Articles

  • Apparatus for determining high-temperature, high-pressure coal plastic behavior under rapid heating conditions. Fong, William S.; Peters, William A.; Howard, Jack B. // Review of Scientific Instruments;Apr1985, Vol. 56 Issue 4, p586 

    This paper describes a rapid-heating, fast response plastometer for measuring the plastic behavior of softening coals under a new range of conditions of industrial and scientific importance previously unattainable with conventional instruments. The results give insights on feedstock...

  • Novel automated micro batch analyzer. Sweileh, Jamal A.; Lopez, Jorge L.; Dasgupta, Purnendu K. // Review of Scientific Instruments;Dec1988, Vol. 59 Issue 12, p2609 

    An automated micro batch analyzer (AMBA) system is described. The sample is introduced into an air-tight reaction chamber (a polypropylene microcentrifuge tube) by a loop injector made from two three-way valves by flowing gas. Reagents/diluents are introduced into the chamber from pneumatically...


    The article focuses on the advantages of installing analyzers in mines. The uses of online analyzers are discussed. The mining and preparation issues address by online analyzers are enumerated. The problems associated with out-of-seam dilution are cited. The importance of over washing is also...

  • A CdS photoconductivity gas sensor as an analytical tool for detection and analysis of hazardous gases in the environment. Miremadi, Bijan K.; Colbow, Konrad; Harima, Yutaka // Review of Scientific Instruments;Oct97, Vol. 68 Issue 10, p3898 

    Develops a highly sensitive gas sensor for detection and analytical identification of hazardous gases, by depositing partially crystalline powder from an aqueous suspension of CdS powder on an alumina substrate. Sample preparation; Schematic diagram of the apparatus and measuring system;...

  • Projecting two-axis nanometer scale displacement of microscopic beads onto a quadrant photodetector with a laser beam Li, Daqun; Schnapp, Bruce J. // Review of Scientific Instruments;Oct97, Vol. 68 Issue 10, p3920 

    Reports that a quadrant photodetector has been added onto a custom differential interference contrast microscope to measure two-axis displacement of silica beads with a noise below 150 Hz. Incorporation of a diode-pumped solid-state laser to function as an optical trap for motility studies of...

  • 20-l explosibility test chamber for dusts and gases. Cashdollar, Kenneth L.; Hertzberg, Martin // Review of Scientific Instruments;Apr1985, Vol. 56 Issue 4, p596 

    The Bureau of Mines has designed a 20-l test chamber for the explosibility testing of dusts, gases, and their mixtures. It can be used to measure lean and rich limits of flammability, explosion pressures and rates of pressure rise, minimum ignition energies, minimum oxygen concentrations for...

  • Rotor electrometer: New instrument for bulk matter quark search experiments. Price, John C.; Innes, Walter; Klein, Spencer; Perl, Martin // Review of Scientific Instruments;Nov86, Vol. 57 Issue 11, p2691 

    The rotor electrometer is a new instrument which we hope will make possible searches for rare fractionally charged impurities in very large quantities of matter. The ultimate goal of the project is to be able to measure the net charge of 10 mg samples of any material to an accuracy of 0.05 q[sub...

  • Efficient 4He cryostats for storage Dewars. Swartz, E. T. // Review of Scientific Instruments;Nov86, Vol. 57 Issue 11, p2848 

    We have designed [sup 4]He cryostats which can be inserted into storage Dewars. These cryostats have the advantages of extremely low (and recoverable) helium consumption, fast cool-down and warm-up times, excellent temperature range and stability, and they supply a low electrical noise and low...

  • Detection of clustered H2 at 4.2 K. Graebner, J. E. // Review of Scientific Instruments;Nov86, Vol. 57 Issue 11, p2827 

    A special calorimeter is described which is capable of detecting molecular hydrogen trapped in solid material. It takes advantage of the energy released by the slow ortho-para conversion of H[sub 2] after rapid cooling from room temperature to 4.2 K. The technique is simple, quantitative, and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics